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Linux/include/net/netfilter/nf_nat.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _NF_NAT_H
  3 #define _NF_NAT_H
  4 
  5 #include <linux/list.h>
  6 #include <linux/netfilter_ipv4.h>
  7 #include <linux/netfilter/nf_conntrack_pptp.h>
  8 #include <net/netfilter/nf_conntrack.h>
  9 #include <net/netfilter/nf_conntrack_extend.h>
 10 #include <net/netfilter/nf_conntrack_tuple.h>
 11 #include <uapi/linux/netfilter/nf_nat.h>
 12 
 13 enum nf_nat_manip_type {
 14         NF_NAT_MANIP_SRC,
 15         NF_NAT_MANIP_DST
 16 };
 17 
 18 /* SRC manip occurs POST_ROUTING or LOCAL_IN */
 19 #define HOOK2MANIP(hooknum) ((hooknum) != NF_INET_POST_ROUTING && \
 20                              (hooknum) != NF_INET_LOCAL_IN)
 21 
 22 /* per conntrack: nat application helper private data */
 23 union nf_conntrack_nat_help {
 24         /* insert nat helper private data here */
 25 #if IS_ENABLED(CONFIG_NF_NAT_PPTP)
 26         struct nf_nat_pptp nat_pptp_info;
 27 #endif
 28 };
 29 
 30 /* The structure embedded in the conntrack structure. */
 31 struct nf_conn_nat {
 32         union nf_conntrack_nat_help help;
 33 #if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE)
 34         int masq_index;
 35 #endif
 36 };
 37 
 38 /* Set up the info structure to map into this range. */
 39 unsigned int nf_nat_setup_info(struct nf_conn *ct,
 40                                const struct nf_nat_range2 *range,
 41                                enum nf_nat_manip_type maniptype);
 42 
 43 extern unsigned int nf_nat_alloc_null_binding(struct nf_conn *ct,
 44                                               unsigned int hooknum);
 45 
 46 struct nf_conn_nat *nf_ct_nat_ext_add(struct nf_conn *ct);
 47 
 48 static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct)
 49 {
 50 #if IS_ENABLED(CONFIG_NF_NAT)
 51         return nf_ct_ext_find(ct, NF_CT_EXT_NAT);
 52 #else
 53         return NULL;
 54 #endif
 55 }
 56 
 57 static inline bool nf_nat_oif_changed(unsigned int hooknum,
 58                                       enum ip_conntrack_info ctinfo,
 59                                       struct nf_conn_nat *nat,
 60                                       const struct net_device *out)
 61 {
 62 #if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE)
 63         return nat && nat->masq_index && hooknum == NF_INET_POST_ROUTING &&
 64                CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL &&
 65                nat->masq_index != out->ifindex;
 66 #else
 67         return false;
 68 #endif
 69 }
 70 
 71 int nf_nat_register_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops,
 72                        const struct nf_hook_ops *nat_ops, unsigned int ops_count);
 73 void nf_nat_unregister_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops,
 74                           unsigned int ops_count);
 75 
 76 unsigned int nf_nat_packet(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
 77                            unsigned int hooknum, struct sk_buff *skb);
 78 
 79 unsigned int nf_nat_manip_pkt(struct sk_buff *skb, struct nf_conn *ct,
 80                               enum nf_nat_manip_type mtype,
 81                               enum ip_conntrack_dir dir);
 82 void nf_nat_csum_recalc(struct sk_buff *skb,
 83                         u8 nfproto, u8 proto, void *data, __sum16 *check,
 84                         int datalen, int oldlen);
 85 
 86 int nf_nat_icmp_reply_translation(struct sk_buff *skb, struct nf_conn *ct,
 87                                   enum ip_conntrack_info ctinfo,
 88                                   unsigned int hooknum);
 89 
 90 int nf_nat_icmpv6_reply_translation(struct sk_buff *skb, struct nf_conn *ct,
 91                                     enum ip_conntrack_info ctinfo,
 92                                     unsigned int hooknum, unsigned int hdrlen);
 93 
 94 int nf_nat_ipv4_register_fn(struct net *net, const struct nf_hook_ops *ops);
 95 void nf_nat_ipv4_unregister_fn(struct net *net, const struct nf_hook_ops *ops);
 96 
 97 int nf_nat_ipv6_register_fn(struct net *net, const struct nf_hook_ops *ops);
 98 void nf_nat_ipv6_unregister_fn(struct net *net, const struct nf_hook_ops *ops);
 99 
100 int nf_nat_inet_register_fn(struct net *net, const struct nf_hook_ops *ops);
101 void nf_nat_inet_unregister_fn(struct net *net, const struct nf_hook_ops *ops);
102 
103 unsigned int
104 nf_nat_inet_fn(void *priv, struct sk_buff *skb,
105                const struct nf_hook_state *state);
106 
107 int nf_xfrm_me_harder(struct net *n, struct sk_buff *s, unsigned int family);
108 
109 static inline int nf_nat_initialized(struct nf_conn *ct,
110                                      enum nf_nat_manip_type manip)
111 {
112         if (manip == NF_NAT_MANIP_SRC)
113                 return ct->status & IPS_SRC_NAT_DONE;
114         else
115                 return ct->status & IPS_DST_NAT_DONE;
116 }
117 #endif
118 

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